Two modes like mentioned above on 7s display. All I know is not suppose to use 91 octane setting unless fuel has no ethanol in it. Dealer told me it has to stay on 87 setting unless you know for a fact 91 fuel is E free. There is no more 91 free fuel in my area, not able to use that mode. Ski is right it has something to do with e fuel is less energy dense too.  So far been no fix for it and USA has rec 90 fuel. Not sure if they have 91 that is e free or not anymore too. 

Here is a good deal IMO.    https://www.facebook.com/share/17gL3dCxCM/  

off to a good start - out twice already before Christmas! Might be a year you set a new record for miles and convince it is time for a new(er) sled you have been window shopping for!

e85 is a lot of ethanol....fuel efficient and making power usually do not go hand in hand I think I will pass on the rabbit hole as well....lol.....racing and all that comes along with that is no longer my passion, but I can only imagine with the technology these days and the issues that need to be dealt with.  

Thanks - so the manufacture detunes the engine in ethanol mode....I assume they are assuming gas with ethanol in it and it possibly sitting is going to happen so erroring on the side of caution.   I have found my 900 can range a fair amount on gas consumption based on how you ride it ....